Abstract
Experimental studies show that the rate of electron diffusion in mesoporous nanocrystallineTiO2 may depend on the electrolyte concentration. In the available literature, thiseffect is attributed to ambipolar diffusion. We present arguments and a kineticmodel indicating that it might instead be connected with different arrangementsof cations near the traps occupied by an electron before and after tunnelling.With a reasonable choice of the ratio of the kinetic parameters, in agreementwith experiment, the model predicts that the electron diffusion coefficient at highelectrolyte concentrations may be about five times higher than at low concentrations.
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